Supramolecular Adhesives to Hard Surfaces: Adhesion Between Host Hydrogels and Guest Glass Substrates Through Molecular Recognition

• Published in: Macromolecular rapid communications. Vol. 35; no. 19; pp. 1646 - 1652
• Main Authors: Takashima, Yoshinori, Sahara, Taiga, Sekine, Tomoko, Kakuta, Takahiro, Nakahata, Masaki, Otsubo, Miyuki, Kobayashi, Yuichiro, Harada, Akira
• Format: Journal Article
• Language: English
• Published: Weinheim Blackwell Publishing Ltd 01.10.2014; Wiley; Wiley Subscription Services, Inc
• Subjects: Adhesion; Adhesives; Applied sciences; Exact sciences and technology; Gels; Glass; Glass substrates; Hard materials; host-guest interaction; Hydrogels; Organic polymers; photo responsiveness; Physicochemistry of polymers; Properties and characterization; Recognition; redox responsiveness; selective adhesion; Solution and gel properties; Stimuli; supramolecular materials; Surface Properties; selective adhesion; host-guest interaction; Graft copolymer; Glass; photo responsiveness; Iron III Chlorides; Cis trans isomerization; redox responsiveness; Colloidal gel; Azo compound; Acrylamide copolymer; Surface properties; Radiation effect; Oxidation; Modified material; supramolecular materials; Adhesivity; Photoisomerization; Polycyclic compound; Experimental study; Ferrocene; Cyclodextrin; Ultraviolet radiation; Iron complex; Medium effect; Molecular recognition; Oside polymer; Inclusion compound
• ISSN: 1022-1336; 1521-3927
• DOI: 10.1002/marc.201400324

Supramolecular materials based on host–guest interactions should exhibit high selectivity and external stimuli‐responsiveness. Among various stimuli, redox and photo stimuli are useful for its wide application. An external stimuli‐responsive adhesive system between CD host‐gels (CD gels) and guest molecules modified glass substrates (guest Sub) is focused. Here, the selective adhesion between host gels and guest substrates where adhesion depends on molecular complementarity is reported. Initially, it is thought that adhesion of a gel material onto a hard material might be difficult unless many guest molecules modified linear polymers immobilize on the surface of hard materials. However, reversible adhesion of the CD gels is observed by dissociating and re‐forming inclusion complex in response to redox and photo stimuli. Hydrogels with cyclic host molecules selectively adhere to guest molecules modified glass substrates. Adhesion depends on the affinity of guest molecules with host molecules. External stimuli regulate the adhesion between host hydrogels and guest substrates. The host molecules of the host hydrogel precisely recognize the hydrophobicity of guest molecules on the glass substrates to create an adhesive force.